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Grade 3 Adding & Subtracting within 1,000 Worksheet with Answers

Grade 3 (US) · Year 4 (UK) · Class 3 (India) · Math

Unit 2: Place Value & Multi-Digit ArithmeticAdd & Subtract within 1,000CCSS 3.NBT.A.2

Adding and subtracting three-digit numbers, including regrouping across zeros. This free upper elementary worksheet has 12 questions and a full answer key. Print it or save it as a PDF — every answer is checked by code, not guessed.

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Adding & Subtracting within 1,000

Grade 3 · Math

Score___ / 12

Name

Class

Date

Learning goal: Add & Subtract within 1,000 · CCSS 3.NBT.A.2

Directions: Solve each problem. Show your work, then write your answer in the box.

Example

803 + 183 = ?

Answer: 986

RememberAdding with regrouping

147+3683tensonesStart with the ones: 7 + 6 = 13.Write 3, carry the 1 ten.Then the tens: 1 + 4 + 3 = 8.47 + 36 = 83
  1. 1

    374 + 422 = ?

    Answer
  2. 2

    132 + 543 = ?

    Answer
  3. 3

    506 - 268 = ?

    Answer
  4. 4

    247 + 359 = ?

    Answer
  5. 5

    331 - 219 = ?

    Answer
  6. 6

    413 + 567 = ?

    Answer
  7. 7

    555 + 350 = ?

    Answer
  8. 8

    586 + 118 = ?

    Answer
  9. 9

    597 + 287 = ?

    Answer
  10. 10

    243 + 137 = ?

    Answer
  11. 11

    740 - 236 = ?

    Answer
  12. 12

    506 - 217 = ?

    Answer

★ Challenge corner for fast finishers

In a number pyramid each brick is the sum of the two bricks below it. The bottom row is 6, 17, 13. What number goes in the top brick?

61713?

How did I do?

Teacher's comments

Free printable worksheets with answer keys · aethelsystems.com/worksheets/math/3/add_3d

Answer key (click to show)
  1. 1.796
  2. 2.675
  3. 3.238
  4. 4.606
  5. 5.112
  6. 6.980
  7. 7.905
  8. 8.704
  9. 9.884
  10. 10.380
  11. 11.504
  12. 12.289
  13. ★53 (challenge corner)

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How to use this worksheet

  • Use it as a 10–15 minute warm-up or homework task rather than a long drill.
  • Ask students to show their working so you can see where a mistake started, not just that it happened.
  • Mark it with the answer key together, then print a fresh version of the same topic to practise the questions they missed.

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